Drilling jar



vPatented Apr. 28, 1925.

UNITED STATES PAUL AnBoN, or '.rUIsA, OKLAHOMA.

DRILLING- JAR.

Application led January 2, 1923. Serial No. 610,263.

To all whom it may concern.'

Be it known that PAULARBON, a subject of the King of Great Britain,residing vat Tulsa, in the county of Tulsa and State of Oklahoma, hasinvented ,certain new. and

useful Improvements in Drilling Jars, of

which the following is a specification.

This invention contemplates the construction of a device of the classmentioned having the advantages of both a swivel socket and a jar.

In drilling oil wells through certain formations such as heavy 'gumboand sticky clay the tools have a tendency to stick and .dive causing anirregular and erratic motion of the walking beam. The jar of theconventional socket type is insufficient to give an upward flow whichwill free the tools in such formations and such efforts as jarringaction have resulted in constructions unsatisfactor from the standpointof strength an durability. For instance in one known construction thereis no shoulder er if a sufficient-shoulder is put in the lower member,it is necessary to weaken the main stem or the outside body. By goingthrough the side of the body it is possible for me to keep my main stemof proper thickness and at the same time have plenty of strengthlthrough the outside body of the socket. Other well known jars are subject to the same complaints and while slight changes may be necessary toovercome same, nevertheless, such changes indicate the differencebetween success and failure in a .drilling operation which is anexpensive undertaking. On the other hand, in the construction of a jarthe necessity of providing a construction which will permit a ropeaction is essential. In other words, at the present time no one jar hasall the essential features to answer the requirements of certaindrilling operations.

L' of the assembled device,

have been made to procure the necessary The present device contains aconstruction 1n com-pllance to the essential requlre- Figure 2 is avertical sectional view of Figure 1,

Figure 3 shows a modified form of the present invention showing themanner of inserting the lower` section',

Figure 4 is a vertical sectional view of Figure 3 with the lower sectionremoved,

Figure 5 is a sectional view on line 5-5 of Figure 1 and Figure 6 is asectional view on line 6-6 of Figure 2.

Referring more to the details of construction attention is directed tothe fact that the upper portion of that type of the present inventionshown'in Figures 1, 2, 5 and 6 is similar to the Burns device and in sofar as the immediate construction is concerned form no part of thepresent invention. For the sake of clearly disclosing the presentnvention, however, the construction will be seen to include the .body Aformed with the lateral opening B through which the swivel head C isinserted, the latter carryin the cable D. The guard pin b extends paralel to the axis of the body and prevents the escape of the swivel. Lowertransverse perforations a are arranged for the reception .of theconventional pin to lprevent the escape of the swivel through thelongitudinal passage.

The body A is elongated for the ap lication of the present invention andthe lbwer portion of this body has extending therethrough a continuationof the longitudinal passage formed in the upper portion for thereception of the swivel, this passage, however, is slightly enlargedfrom the lower walls of the transverse pin perforations, downwardly asindicated by reference character E. Two oppositely arranged lateralpassages extend through the walls at F and F for a considerable portionof their length for the reception of the lateral extension on the lowersection as will more clearly appear. y

The lower member G includes the body and the upper annular shank; Thisupper' shank includes the flattened head portion formed by the lateralextensions g and g" and the vertical extension g", the entire head beingin the form of a cross. The arms or extensions g, g are constructed to tand travel within the passages F and F extending outwardly andterminating liush with the outer face of the body portion A.. The

upper extension corresponds in dimensions within the passage during theupper movement of the head, it being apparent that the lateralextensions g and g at the end of their upward stroke engage the walls fand f.

A T he upper annular shank -is of suiiicient' diameter to permit properclearance during movement within the longitudinal passage as shown moreclearly in Figure 6, this figure also showing more clearly thearrangement' of the head within the passage.

In Figures' 3 and 4 the inventionis sho-wn without the swivel socket asthere are cases Figure-3 also ls owsclearly the method of constructingand assembling the two sections of the jar. In this ligure and -the samemethod applies to that form sho-wn in Figures l and 2, the lower endofthe body is cut for a distance equal to the 'length of the enlargedlongitudinal passage or for such a distance as may be necessary toprocure the pro er expansion to permit the introduction ci) the head ofthe lower section. This cut indicated by reference character H is madeby any suitable ymeans such as by a saw and the leg sections it and h'are exanded until the head can be inserted. The egs k and lz. can thenbe brought together by a hammer or other suitable mechanism andelectrically welded.

Particular attention is directed to the assembling of the elements andthe relation of the parts whereby the strong, durable and compactconstruction is obtained.

What I claim as new and useful and desire to secure by Letters Patent,is.:

1. A jar comprising an uncut solid body portion free from joints andhavingan extension provided at opposite sides with welded jointsextending throughout the len th of the extension, said extension inclu'ng two sections integral with the body portion and connected togetherby said welded joints, each of said sections being provided with aninternal longitudinally extending groove and a slot extending throughits wall from its outer surface to the groove, the slots having theirouter'ends open at all times to permit dirt and the like to pass out ofthe Slo-ts, aA stem of slightly less diameter than the body arranged insaid grooves and having a attened cross-shaped head, the arms of lwhichare slidably mounted in said slots, the upper ends of said grooves beingspaced from the upper ends of the slots a distance equal to the lengthof the head above the arms to permit the arms to strike the upper endsof the slots simultaneously with the impact of the head against theupper ends of the grooves.

2. A jar as claimed in claim 1in which `the stem is provided with anannular shoulder arranged below the extension of the body portion andadapted to engage the lower end of said extension during the oper-\ation of the jar.

3. A jar as claimed in claim 1in which the body portion is provided witha bore extending from its upper end to said grooves, a cable extendingthrough the upper end of the body portion into said bore and. having itslower end swiveled and axially movable within the bore, and means in thebody portion above the grooves to permit a cross-pin to be passed acrossthe bore for preventing the swivel from falling downwardly into saidgrooves. l

4. A jar comprising a tubular body portion free of joints and having anextension at its lower end provided at opposite sides with welded jointsextending throughout the length of the extension, said extensionincluding two sections integral with the body portion Aand connectedtogether by Welded joints, each of said sections being provided with aninternalv longitudinally extending groove and a slot extending throughits wall from its outer surface to the groove, the grooves forming apassageway coaxial with the bore ofthe body portion, a cable .rotatableand axially movable in the upper end of the bore ofthe body portion andprovided atits lower end with a swivel, said body portion having portsextending through the same to receive a pin for limiting the downwardmovement of the swivel, said ports being arranged above the grooves, anda stem of slightly-less diameter than the body portion arranged in saidgrooves and having a flattened cross-shaped head, the arms of PAULARBON.

